| 摘要 |
A horizontal line processor for loading print instruction commands into selected locations in a full page bit map memory. The horizontal line processor includes: a font memory for storing bit representations of print instruction commands; a means for receiving commands indicating the type of operation and the location of an operation to be performed on the printing instructions in the full page bit map memory; a sequencer for controlling the horizontal line processor in response to the instructions; an address control unit for incrementally and sequentially generating the addresses of full page bit map memory locations where the printing instructions are to be modified, and the addresses of font memory locations containing bit representations of printing instructions to be loaded into the full page bit map memory; and, a data control unit for retrieving printing instructions from the full page bit map addresses generated, loading thereinto the bit representations to generate updated printing instructions, and loading the updated printing instructions into the full page bit map memory. The address control unit and the data control unit are concatenated so that for each command to load printing instructions the printing instructions are updated along an entire section of an X-axis line in a single pass.
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